First indicator - Restriction

#  No information provided

0  No restrictions

1  Restrictions apply

Second indicator:

#  Undefined


a  Terms governing access (NR)

b  Jurisdiction (R)  [Not applicable]

c  Physical access provisions (R)  [Not applicable]

d  Authorized users (R)  [Not applicable]

e  Authorization (R)  [Not applicable]

f   Standardized terminology for access restriction (R)

u  Uniform Resource Identifier (R)

2  Source of term (NR)

3  Materials specified (NR)

5  Institution to which field applies (NR)

6  Linkage (NR)

8  Field link and sequence number (R)

NOTE:  See MARC 21 Format for Bibliographic Data (506 Restrictions on Access Note) for code definitions not given below.


Field 506 contains information about restrictions imposed on access to the serial.  For published works, this field is used to record information on limited distribution.

First indicator - Restriction

The first indicator defines a restriction flag as follows:

#    No information provided.

Value # indicates that no information is provided about whether the note states that materials are restricted or unrestricted.

0    No restrictions.

Value 0 indicates that the field affirms an absence of access restrictions.

1    Restrictions apply.

Value 1 indicates that the field defines access restrictions to some or all of the material described.


$a  Terms governing access.

The terms governing access identify legal, physical, or procedural restrictions imposed on individuals wishing to see the described materials.  These restrictions must apply to all copies of a serial.  Local restrictions may be input in a 590 field.

506 ## For official use.

506 ## For official University and Alumni Council use, and also for individual communication of a personal nature between those listed therein.

506 ## For restricted circulation--not for publication.

506 ## Prior to 1981, distribution was limited to federal judicial personnel.

506 ## Not available for commercial use, sale, or reproduction.

506 ## Restricted to institutions with a print subscription and a site/user ID and password.

506 ## Subscription and registration required for access.

If a note addresses the intended audience of a publication and does not imply restrictions on access, it should be tagged 521.

$f  Standardized terminology for access restriction.

Subfield $f contains data from a standardized list of terms indicating the level or type of restriction.

$2  Source of term.

Subfield $2 contains a MARC code that identifies the source of the term used to record the restriction in subfield $f.  The source of the MARC code is Source Codes for Vocabularies, Rules, and Schemes (Access Restriction Term Source Codes) that is maintained by the Library of Congress.  If different sources are recorded, separated fields should be used.

$6  Linkage.

For instructions on the use of subfield $6, see field 880.

Related fields, etc.

Notes - General Information, 521

506 Restrictions on Access Note  (MARC 21 Format for Bibliographic Data)

See also:

5XX  Note Fields

Variable Data Fields

Section E.  MARC 21 Format for Serials as Applied Within CONSER

CONSER Editing Guide:  Contents