The phrase "a rigid code of" is correct and usable in written English.
It can be used when referring to a strict set of rules or guidelines that govern behavior or practices in a particular context.
Example: "The organization operates under a rigid code of ethics that all employees must adhere to."
Alternatives: "a strict set of" or "an inflexible system of".
So album leakers adhered to a rigid code of silence.
"It's a rigid code of segregation along ethnic and racial lines.
Known for enforcing a rigid code of conduct, she has been characteristically guarded during the crisis.
At Thanksgiving, the country adheres to a rigid code of culinary uniformity.
Written in the style of the Qurʾān, the book contains a rigid code of conduct regulating the affairs of the community.
This clear, concise concept entailed a rigid code of interior comportment for a new generation of young urban professionals, a group that wanted to avoid broad-shouldered 80's excess without actually giving up the habit of conspicuous consumption.
"We bring with us a very rigid code of conduct, which isn't necessarily very popular in a place like Angola, which has this reputation for corruption," Mr. Rhind said.
One misperception about jazz, insidious enough to be shared by many of its proponents, is that the music adheres to a rigid code.
But I suspect it will always have to make it up as it goes along, operating pragmatically rather than following a rigid code.
And in Canada's Banff National Park, a popular hiking trail now has even an even more rigid code of human behavior, with a requirement that all hiking parties must include at least four people — one of whom, at a minimum, must be armed with bear spray for defense.
Fatany brings home her message: "It is time that we recognize that there are Saudi women who have a more modern approach to life and do not subscribe to the rigid code of dress and a lifestyle that is based on extremist interpretations of Islamic rulings".
