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Definitions of discretionary access control:

A means of restricting access to objects based on the identity of subjects and/or groups to which they belong. The controls are discretionary in the sense that a subject with a certain access permission is capable of passing that permission (perhaps indirectly) on to any other subject (unless restrained by mandatory access control).
www.kernel.org/pub/linux/libs/security/Orange-Linux/refs/Orange/Orange0-5.html
Check the validity of credentials given at the discretion of the user (eg, username and password).
www.cafesoft.com/support/security-glossary.html
A means of restricting access to objects based on the identify of the principal.
publib.boulder.ibm.com/infocenter/clresctr/topic/com.ibm.cluster.pssp.doc/pssp35/am0a0mst/am0a0mst16.html
Discretionary Access Control (DAC) defines basic access control policies to objects in a filesystem.
en.wikipedia.org/wiki/Discretionary_access_control