The company I'm at currently has them on a separate network drive and people have read-only access to pdf versions of the approved procedures. The Quality Manager controls access to documents when they need to be revised and then updates the network drive with the updated versions.
One thing you have to ensure is that only the most current documents are being used. If people are allowed to print off procedures and never check to see if they've been updated, they could end up using an obsolete procedure, which could result in adulterated product. Our documents are printed off with a watermark and are only good until midnight of the day they're printed.