Check out "Extraction" in the Articles section of this site.
The easiest way I've seen to get shows onto a PSP is to use "CloneDVD Mobile."
TechLore Blog
HR10-250, Samsung SIR-S4120R, SIR-S4080R, 2 Philips DSR704s (one connected to a Slingbox A/V). One box used the "Zipper"; rest used PTVnet to enable networking features.
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