506 Restrictions on Access Note

Field definition and scope:

Field 506 contains information about restrictions imposed on access to the described materials.

For published works, this field contains information on limited distribution. For continuing resources, the restrictions must apply to all issues.

If a note merely indicates the intended audience of a publication and does not imply restrictions on access, it is recorded in field 521 (Target Audience Note). Terms governing the use of materials after access has been allowed are recorded in field 540 (Terms Governing Use and Reproduction).

The National level record requirement for this field is Optional.

Field 506 is repeatable.

Guidelines for applying content designators:

For indicator and subfield code definitions and examples, National-level (NLR) and Minimal-level (MLR) record requirements, and designator repeatability, see table below:

Position	Description	NLR	MLR	Repeatability
Field 506	Restrictions on Access Note	O	O	R
Indicator:
First	Restriction	M
#	No information provided	A
0	No restrictions	A
1	Restrictions apply	A

Second	Undefined; contains a blank	M

Subfield code:
$a	Terms governing access	M	O	NR
$b	Jurisdiction	A	O	R
$c	Physical access provisions	A	O	R
$d	Authorized users	A	O	R
$e	Authorization	A	O	R
$f	Standardized terminology for access restriction	O	O	R
$g	Availability date			R
$q	Supplying agency			NR
$u	Uniform Resource Identifier	O	O	R
$2	Source of term	A	O	NR
$3	Materials specified	O	O	NR
$5	Institution to which field applies	A	O	NR
$6	Linkage	A	O	NR
$8	Field link and sequence number	O	O	R

Input conventions:

Punctuation

Content designator history:

Subfield $u - Uniform Resource Identifier [new, 2002]

First Indicator - Restriction [new, 2006]

Subfield $f - Standardized terminology for access restriction [new, 2006]

Subfield $g - Availability date [new, 2019]

Subfield $q - Supplying agency [new, 2019]

Subfield $2 - Source of term [new, 2006]