Protection mechanisms for disk and tape files

The following table provides an overview of the available protection mechanisms:

Object	Protection mechanism	Restricted pubset access ACCESS, USER-ACCESS BACL Password File encryption Retention period GUARDS
		1	2	3	4	5	6	7
File	Public	+	+	+	+	+	+	+
	Temporary	-	-	-	-	+	-	-
	Private	-	+	+	+	-	+	-
	Tape	-	+	-	+	-	+	-
File generation group	Index public, FGen public	-	+	+	+	+	+	+
	Index public, FGen tape	-	+	+	+	+	+	+
	Index private, FGen private	-	+	+	+	-	+	-

Table 15: Possible uses of the protection mechanisms (+ =can be used, - =cannot be used)

The scope of the protection mechanisms for disk and tape files depends on the file type: the attributes for “standard access control”, “retention period”, “password” and “DESTROY option” apply either fully or only partially.

Disk files

The following tables show the permissible value ranges for the various operands in a macro and in a command.

Macro

File type	Standard access control		BACL	GUARDS	RETPD	RDPASS, WRPASS, EXPASS	DESTROY
	ACCESS	SHARE
Permanent	Y	Y	Y	Y	Y	Y	Y
Temporary	WRITE	NO	N	N	Ignored	NONE	Y
Generation	Y	Y	Y	Y	Y	READ/ WRITE	Y

Table 16: Protection mechanisms for disk files (macro)

Command

File type	Standard access control		BACL	GUARDS	EXPIRATION- DATE	READ-, WRITE-, EXEC- PASSWORD	DESTROY
	ACCESS	SHARE
File type	Y	Y	Y	Y	Y	Y	Y
Permanent	WRITE	OWNER-ONLY	N	N	Rejected	*NONE	Y
Temporary	Y	Y	Y	Y	Y	READ/ WRITE	Y

Table 17: Protection mechanisms for disk files (command)

Tape files

The following tables show the permissible value ranges for the various operands in a macro and in a command

Macro

File type	Standard access control		RETPD	RDPASS, WRPASS, EXPASS	DESTROY
	ACCESS	SHARE
File type	Y	Y	Y	Y	Y
File type	Y	Y	Ignored	Y	Y
Permanent	Y	Y	Y	READ/ WRITE	Y

Table 18: Protection mechanisms for tape files (macro)

Command

File type	Standard access control		EXPIRATION- DATE	READ-, WRITE-, EXEC- PASSWORD	DESTROY
	ACCESS	SHARE
File type	Y	Y	Y	Y	Y
File type	Y	Y	N	Y	Y
Permanent	Y	Y	Y	READ/ WRITE	Y

Table 19: Protection mechanisms for tape files (command)

Y:	the operand may be used with all possible operand values
N:	the operand is not permissible
other entries:	these are default values which cannot be changed