William Fenton was earlier convicted of lacing his victims' drinks with a substance, rendering them unconscious, before abusing them.
Fenton, 55, indecently assaulted three women and raped a fourth. Police found footage of his offending when his mobile phone was examined.
Fenton, who was previously jailed for rape, indecent assault and drugs offences in Northern Ireland, continued to claim he was wrongly convicted of his latest string of offences after his move to resettle in Ayrshire.
Lord Burns told him at the High Court in Edinburgh: "The risk you present to the public is a high one and you are really a clear danger to females."
The judge imposed an Order for Lifelong Restriction on Fenton and ordered that he serve a minimum term of six years in prison before he becomes eligible to seek parole.
Defence solicitor advocate Edward Gilroy told the judge: "He continues to maintain he has been wrongly convicted."