It has 873 unique entries, including URLs, Locations, Event names, random collections of numbers, website names and all sorts of other rubbish.

I think it suggests a need for the field length to be restricted in size, if nothing else and add an additional field to allow for the event name etc. for which that specific certificate was given.

Anyway, here is the list of entries and the rubbish in there: (Entries are cropped at 20 characters, as I had never envisioned a certificate, which is usually nothing more than a few characters, needing more.)

    เรท G 
 (Cairo Internationa
 (Singapore Internat
 (Taormina Film Fest
 (Women's Cinema fro
 \
 2
 G
 K-15
 Kids+13
 No recomendada para
 PG-13
 R-13
 R-16
 R-18
 R15+
 ท ทั่วไป
-
--
-12
-16
!6
?
.
...
(Alice nella Città)
(Donostia-San Sebast
(Film Fest Gent)
(Future Film Festiva
(Locarno Film Festiv
(Montréal Film Festi
(Pesaro Film Festiva
(Pesaro Nuovo Cinema
(Rome Cinema Fest)
(San Sebastian Film 
(Thessaloniki Docume
(Thessaloniki Intern
(Torino Film Festiva
(Venice Film Festiva
//
\
+ 13
+12
+13
+15
+16
+18
+7
< 16
0
0+
000005
0003
0004
0084792
0094633159792 
0094634048392
0094636997193 
0179976
03/11/1969
05
0602537509133
06242085
0724354451195 
0828766815290 
1
10
10 anos
10 April 1993   
10 V
10-12PG V
10V
11
11 år
11 year
11-
11/11/1965
11år
12
12 – 
12 anos
12 éven aluliak szám
12 éven aluliaknak n
12 jaar
12 lat
12 years
12-
12-KT
12-rated
12/28/1968
12+
123
1234
124 minutes
12A
12E
12PG
12q12
12세 관람가
12세 이상 관람가
12세이상 관람가
12세이상관람가
12회 EBS 국제다큐영화제
13
13 LV
13 SL
13-A
13+
13A
13L
13M-LV
13PL
13V
13VL
14
14 anos
14/12
14+
14A
15
15 (Asiana Internati
15 År
15-
15-A
15+
15A
15år
15세 관람가
15세 이상 관람가
15세이상관람가
16
16 anos
16 éven aluliak szám
16/14
16+
16+ (PG)
16680-7294276224663
16E
16L
16LPV
17
18
18 anos
18 éven aluliak szám
18 Restricted
18-
18+
18A
18PL
18세 관람가
18세 이상
18세 이상 관람가
19
19+
1962
1977-01-31
1977-11-09
1978-12.06
1981-06-29
1990
1995
1997
2
20
2001
2004
2004-01-01
2009
2009-03-06
2010
2011
2012
2013
2013-06-23
2013-09-11
21
23
24
27
28
29
3
3+
30
3242354214
352
36198
4
5
5.0
5.1
5099902990194 
5099923638495
5099930904095 
5099950144297 
5099970504125
5099990658495
521247
5425019001216
6
6 éven aluliak számá
6,2
6.0
6+
7
7 år
7.0
7.5
7+
7290015069342
7290015532457
7290372202345
7392735993577
8
8.5
828766156294
8714221037401
9
A
A - Tilladt for alle
A műsorszám megtekin
A.P.
AA
aaa
ab 12
ab 16
ab 18
ac-3
Adam Haskell
Adoro Cinema
adult
Adventure
Aerofilms
AKA
AL
Al Jazeera Internati
ALL
All Ages
all public
Alle
Alle leeftijden
Allowed for children
AM18
Amazon
Amsterdam, premiere
Animaatio
animovaný
Announced release
Approved
APTA
Apta para mayores de
APTO
Argentina-13
Arte
Asia-Pacific Film Fe
ATP
ATP C/RES.
austrianfilm.at
Azerbaijan
B
B-12
B-15
B.O.
B009VKL8EM
B15
BA
BAFICI
bahmani
Bangladesh
Banned/18
Barcelona Gay and Le
Barn
Barnefilm
Barnförbjuden
Barntillåten
BIFF - Brasilia Inte
BIFFF
big
Biograf
Bioscop
Blu-ray
Bola Dunia Film
BR
Brascine
Brasil
Brasília
Brazil
Brazil:12
Breda B-movies, Unde
BT
Btl
Bucheon Internationa
Buena Vista
Buenos Aires Interna
Busan Film Festival 
C
Cairo International 
Cartoon Network
CAT II
CAT III
CAT-III
CAT3
Category 3
Category I
Category II
Category III
CC BY-NC-ND 3.0
ccc
Central Board of Fil
CERO Z
Certificado de Produ
Certified
chilevision
Cinéma Grand Action 
Cinemanila Internati
Cinemateca Portugues
CJ Entertainment
Comedy
comeida terror
comidie
Corto
CZ
D
Day to GO!
dcp
defined
Dewasa
Drama
Dubai International 
DVD
DVD premiere
E
E (Exempt)
e 10
e 12
e 14
e 16
e 18
e Livre
É Tudo Verdade
EA
Egypt
EM
ENA
Enregistré le
EUR
Everyone
Ex
Exempt
f
Faeria
Family
Fantaspoa
Farol
feibris
festival
festival (Locarno)
festival (London)
festival (Venice)
festival (VIFFF)
Festival de Cine de 
Festival de Cinema L
Festival di Venezia
Festival Screening
fgfg
FIC
FID Marseille
Fida Film
Film Festival
Film Indonesia
Film per Tutti
Filmax
Filme B
FilmeNow
finland
Finland:K-16
first screening
For Alle
for minors above 12 
Foreing
fr
Från 11 år
Från 15 år
Från 7 år
France 2
Freigegeben ab 16 Ja
FSK
FSK 0
FSK 12
FSK 16
FSK 18
FSK 6
FSK ab 0 freigegeben
FSK-0
FSK-12
FSK-16
FSK-18
FSK: 12
FSK: 6
FSK0
FSK12
FSK18
FSK6
full
G
G - All Ages
Galway Film Fleadh
Gaumont
general
Genoa
Gijon Film Festival
Goloubou
Gothenburg Internati
Greece
Grota da Luz, Grajaú
gucca.dk
Helsinque
hjk
hoc
Hong Kong:IIB
HongKong
http://awaproduccion
http://en.wikipedia.
http://eng.jiff.or.k
http://ja.wikipedia.
http://movie.douban.
http://musik.ciao.de
http://mydramalist.c
http://www.alcine.or
http://www.blitz-cin
http://www.bol.com/n
http://www.cultnews.
http://www.dfi.dk/fa
http://www.filmfund.
http://www.imdb.com/
http://www.njutafilm
https://es.wikipedia
https://fa.wikipedia
https://iffr.com/en/
https://www.facebook
Human Rights Nights 
I
I I B
IB
IDFA Festival
II
II B
IIA
IIB
III
IKFD Archive no. 5
iksv.org
Imbdb
IMDB
imdb.com
INCAA
Indie Festival
Indonesia
Indonesian Film
Infantil
International Film F
Internet
isrc be
IT
ITA
Italian censorship v
iTunes Store
Ja
Janela de Cinema
Japan
Japan PG-12
JP
K
K 11
K-10
K-11
K-12
K-13
K-14
K-15
K-16
K-17
K-18
K-3
K-6-4
K-7
K-8
K-9
K11
K12
K13
K15
K16
K17
K18
K3
K7
Karama Film Festival
Karlovy Vary Film Fe
Karlovy Vary Interna
Katas ng Saudi
Kids
Kids+13
Kids+16
Kiefer Mathieu
Kinderen toegelaten
Kis+13
KN
KNT
Korea
KSLV-0001–0003
KT
L
Leyfð
Libre
limited
Livre
Locarno Film Festiva
London
luca
M
M Moderate coarse la
M/12
M/12Q
M/14
M/15
M/16
M/16Q
M/18
M/3
M/4
M/6
M12
M14
M16
M18
M4
M6
MA
MA 15+
MA+
MA15
MA15+
MA18
MadriDocs
Magic Box
Malaysia:U / Hong Ko
Marecek
Maxima Pictures
Mayores de 16 años
ME
Metropolis Cinema
Mexico
MG6
Mild
Mitra Pictures
Mládeži přistupný
Moscow Film Festival
Mostra de Tiradentes
MotelX
moviezoo.dk
mpiaa
mpla Filmes; Planifi
MultiVision Plus
Multivision Plus Pic
Music
Musical
mymovies
N
N-13
N-16
N-7
n/a
NA
National Film Corpor
naver
NC-16
NC-17
NC16
New
New century fox
New Horizons Film Fe
ni
Night Visions Film F
NL-16
nl/6
NN
No
No Recomendada Menor
none
nordic film
Not Rated
NR
NR -18
NR-12
NRK
NYFF
o.A.
od 12 lat
od 13 lat
od 15 lat
od 16 lat
od 7 lat
od b/o lat (MPAA: G)
od lat 12
Odeon
Ohne Altersbeschränk
OK
OM
Oracle7
Original release dat
Osaka Asian Film Fes
oui
Oulu International C
Out
P
P13
P15
Passed
Pathé
Paulínia Film Festiv
PC
PD-14
PEGI leeftijd 0+
Per tutti
Pesaro Film Fest
PG
PG - 12
PG 13
PG-10
PG-12
PG-13
PG-13 - Teens 13 or 
PG-14
PG-15
PG-16
PG-17
PG0
PG10
PG12
PG13
PG16
PGL
PHOEBUS CARTEL
Planete+ Doc Film Fe
Planned
PM13
PM16
Portobello Film Fest
Poster
premiere
Preview
PT
PT Investasi Film In
PT Rapi Films
pt-br
Públicos
Pula
QA
Qatar Cinemas
R
R 13
R 18+
R-
R-12
R-13
R-15
R-16
R-18
R(A)
R+
R12
R13
R15
R15+
R16
R18
R18+
R18+ Japan
R21
Rapi Films
Rate E
rated R
RC
re-release
Release
released
Restricted
Rio de Janeiro Inter
Rock in Rio
Rome Cinema Fest
Rosemberg Retrospect
Rotterdam Internatio
RS
RU
ruby
Running Man
Rus
Russia
S
S-3
sa
San Sebastian Intern
Semana dos Realizado
Seniman
short
Short Film
Showlivre
si
Signas-O
Sikanda
Sinag Maynila Film F
Sitges Film Festival
Sixteen or over
Skop Production
Snuls certified
Som Livre
South Africa-13L
Spitfire
Star Cinema
Stockholm Filmfestiv
SU
Sulmona Film Festiva
Sunrise
Sv
SVT
Sydney Film Festival
Syldavia Cinema
T
TBA
TE
Thai
Thailand
Theatre
Theatrical
Thessaloniki Documen
Thessaloniki Interna
Tilladt for alle
Tillatt for alle
Tiradentes
Toda La Familia
Todos
Todos los públicos
Toei Animation, Asat
Tous Public
Tous Publics
TP
TR
True/False Festival
TT
tt0079694
tt0095961
tt0378458
tt1866143
tt2058001
tt2630028
tt3196748
Turin Film Festival
Tutti
TV
TV Movie
TV premiere
TV-14
TV-14 V
TV-G
TV-MA
TV-PG
TV-Y
Tvoj Tatko Records s
tw
U
U/A
UA
Uc
UIP Türkiye
Uj
Ukraine
UN
Unclassified
Undefinde
Undefined
Univeral
Universal
Universal Music (3) 
Unknown
Unrated
UR
us
USA
USA-R
USA:Approved
V
V.M. 14
V.M. 18
VAP
Venezia 72
venice film festival
Verbascum Imago
Video
Video Premiere
VideoRun Restart
Vienale
vietnam
vimeo
VM 14
VM 18
VM-14
VM14
VM18
VN
Voksen
Warsaw Film Festival
WIkipedia
World premiere
ws
www.facebook.com/nen
X
X-18+
X18+
XXX
y
Y7
Yes
YouTube
Κ-13
Κ-17
Κατάλληλο για όλους 
А
Б14
БА
В
Двадцатый Век Фокс С
Е16
Е18
ж
й
К
НА
Наше Кино
Союзмультфильм
СССР
Централ Партнершип
מותחן חדש שכתב והפיק
ฉ 20+
ท
ท ทั่วไป
ทั่วไป
น 13+
น 15+ 
น 18+
น13+
น15+
น18+
ส
เรท G 
เรท R
เรท ท ทั่วไป 
เรท น 13+ 
เรท น 15+ 
中国
成人
无
등급 없음
등급보류 / 청소년관람불가
액션
전제 관람가
전체 관람가
전체관람가
전첸관람가
청소년 관람 불가
청소년 관람불가
청소년관람불가