Read protect ATTiny85

I am programming an ATTiny85 with the Arduino Uno Board.

Is it possible to enable the read protection fuse, using the Arduino as ISP or I have to use an external programmer?

Regards.

Yes. You have to use "avrdude" from the command line. Google has examples...

PS: Did you mean "write protect"? Read protection seems a bit pointless.

Read protection seems a bit pointless

Read protection is used to protect against copying the hex-dump of the code from the chip.