I ran into this by looking at Plugins in the brasero Edit menu and see:
"The version of "libdvdcss.so.2" is too old" although my installation of libdvdcss.so.2 is fine.  Also, trying to copy a protected dvd with brasero gives an error:

All required applications and libraries are not installed.
Please install the following manually and try again:
libdvdcss.so.2 (library).

Google shows many such reports and the provided demonstration url pointed me to a probable cause:  brasero in Mageia uses a version check that has been dropped as of libdvdcss 1.3.0:

Changes between 1.2.13 and 1.3.0:
---------------------------------

  * Dropped deprecated, undocumented API:
    - the function dvdcss_title()
    - the type dvdcss_handle
    - the variable dvdcss_interface_2
...
https://abi-laboratory.pro/tracker/changelog/libdvdcss/1.3.0/log.html

Gnome removed this check from brasero 11 months ago:
"Remove check for dvdcss_interface_2"
https://gitlab.gnome.org/GNOME/brasero/blob/master/plugins/dvdcss/burn-dvdcss.c

and looking at this file in the referenced source rpm, I see the obsolete code is still there:

#define BRASERO_DVDCSS_I_BLOCKS 16ULL

static GObjectClass *parent_class = NULL;

static gboolean
brasero_dvdcss_library_init (BraseroPlugin *plugin)
{
        gpointer address;
        GModule *module;

        if (css_ready)
                return TRUE;

        /* load libdvdcss library and see the version (mine is 1.2.0) */
        module = g_module_open ("libdvdcss.so.2", G_MODULE_BIND_LOCAL);
        if (!module)
                goto error_doesnt_exist;

        if (!g_module_symbol (module, "dvdcss_interface_2", &address))
                goto error_version;

        if (!g_module_symbol (module, "dvdcss_open", &address))
                goto error_version;
        dvdcss_open = address;
                                                                               98,1-8        11%

Thanks.