This is quite a ubiquitous collocation, especially when talking about conventions/legal documents/law etc:

"This principle is enshrined in the Geneva Conventions, and is a responsibility of warring parties, just as much as it is an ethic to be pursued..."
http://www.doctorswithoutborders.org/ng/ep2/ep2_qa.html

"the clause would undermine the right to free legal advice in custody that has been enshrined in English law through statute and case law.."
http://www.lawgazette.co.uk/news/opponents-win-custody-advic...

Basically, I wouldn't raise an eyebrow if I came across it, and in this context, this semi-fixed phrase is practically expected.

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Note added at 45 mins (2012-02-03 16:43:47 GMT)
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Also...(very contemporary and same context):
"The new waste regulations coming into force on 29th September 2011 are going to make waste management a lot more complicated.
This change is enshrined in The Waste(England and Wales) Regulations 2011 which came into force on the 28th March 2011."
http://www.wastecare.co.uk/regulations/the-waste-regulations...